After observing the video footage, it looks like the motor ejection charge fired a fraction of a second after lift off separating the payload bay, upper body tube and nose cone as Mark said. I say motor ejection charge because neither ignitor from the dual deploy/altimeter fired after looking at it. WHile I was doing the video editing I was able to do a zoom in on the clip and see a definite explosion that separated the lower half of the rocket from the upper half. I also did not see any evidence of the body tube folding over under too much force. That is my theory. Here is the video - http://youtu.be/wx4adY_tk8s Not sure I have seen anything like that before. Especially the lower half of the rocket under power and not being too unstable to fly. like you said Mark, an air to ground missile that covered a lot of ground. It was a descent day to fly thanks everyone. Bert